IDT82P20416 Integrated Device Technology, IDT82P20416 Datasheet - Page 22

• Manufacturer Part Number: IDT82P20416
• Description: 16-channel Short Haul T1/e1/j1 Line Interface Unit
• Manufacturer: Integrated Device Technology

Figure-6 Receive Differential Line Interface with Twist-
3.2.2
receive sensitivity.
3.2.2.1 Line Monitor
Intrusive Monitoring per T1.102 can be performed between two devices.
The monitored channel of one device is in normal operation, and the
monitoring channel of the other device taps the monitored one through a
high impedance bridging circuit (refer to Figure-7 and Figure-8).
RRINGn of the monitoring channel is dramatically attenuated. To
compensate this bridge resistive attenuation, Monitor Gain can be used
to boost the signal by 20 dB, 26 dB or 32 dB, as selected by the MG[1:0]
bits (b1~0, RCF2,...). For normal operation, the Monitor Gain should be
set to 0 dB, i.e., the Monitor Gain of the monitored channel should be 0
dB.
Partially Internal or Fully Internal Impedance Matching mode. Here the
external r or internal IM is used for voltage division, not for impedance
matching. That is, the r (IM) and the two R make up of a resistance
bridge. The resistive attenuation of this bridge is 20lg(r/(2R+r)) dB.
ed Pair Cable (transformer-less, non standard compli-
Functional Description
IDT82P20416
The equalizer compensates high frequency attenuation to enhance
In both T1/J1 and E1 short haul applications, the Protected Non-
After the high resistance bridging circuit, the signal arriving at RTIPn/
The monitoring channel can be configured to any of the External,
Note that line monitor is only available in differential line interface.
Note:
EQUALIZER
6.0Vpp
1. Two Rr/2 resistors should be connected to VCOM[1:0] that are
coupled to ground via a 10 µF capacitor, which provide 60 Ω
common mode input resistance.
2. In this mode, lightning protection should be enhanced.
3. The maximum input dynamic range of RTIP/TRING pin is
-0.3 V ~3.6 V (in line monitor mode it is -0.3 V ~ 2 V)
Rr/2
Rr/2
ant)
RRINGn
RTIPn
10 µF
VCOM1
IM
VCOM0
22
16-CHANNEL SHORT HAUL T1/E1/J1 LINE INTERFACE UNIT
3.2.2.2 Receive Sensitivity
for which the receiver recovers data error-free with -18 dB interference
signal added.
dB.
dB.
The receive sensitivity is the minimum range of receive signal level
For Receive Differential line interface, the receive sensitivity is -15
For Receive Single Ended line interface, the receive sensitivity is -12
connect point
connect point
R
DSX cross
DSX cross
Figure-8 Transmit Path Monitoring
R
Figure-7 Receive Path Monitoring
R
R
RRINGn
RRINGn
RRINGn
RTIPn
RTIPn
r
r
RTIPn
TTIPn
TRINGn
monitoring channel
= 20/26/32 dB
monitoring channel
= 20/26/32 dB
monitor gain
monitored channel
monitored channel
monitor gain
December 17, 2009
monitor gain
monitor gain
= 0 dB
= 0 dB